Steam-engine valve-gear.



APPLICATION FILED SEPT. 2, 1914; v

S. G. COLSON.

STEAM ENGINE VALVE GEAR.

Patented Apr. 20, 19,15.

3 SHEETS-SHEET 1.

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STEAM ENGINE VALVE GEAR.

APPLICATION FILED SEPT. 2, 1914.

1,136,893, Patented Apr20, 1915.

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STEAM ENGINE VALVE GEAR.

APPLICATION FILED SEPTLZ, 1914.

1,136,893, Patented Apr 20, 1915.

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' SAMUEL G. GQLSON, or .Asnron, InAHo.

Yemen-ENGINE VALVE-GEAR.

s ecification of Letters Patent. Pat t 20, 1915 Application fii'ea's'e tembr 2, i914. Serial No. 359,904.

T all whom it may concern:

Be it known that I, SAMUEL v and'I declare the following to be afull,

- clear, and exact description of the same, such as will enableothers skilled in the artto which it appertains to make and use thecompanyingdrawings, and to letters or fig ures of reference marked thereon, wh ch form a part of this specification.

invention, reference being had to the ac- .Figure 1 is a longitudinal section of the invention taken on the line 1 -1, Fig. 2. Fig; 2 is a plan view ofthe steam chest and -0yl1IlCl'C with parts removed. Fig. 3 is a section on the line 33, Fig. fhparts being broken away. Fig. 4 is a diagrammatlc view in section, the section being taken cir- ,cularly through the two setsof diametrically opposite lateral ports, and straigstened out, an arrow showing the-lead to start the engine and another arrow the exhaust. Fig.

5 is a detail'plan View of the steam'che'st with top removed. Fig. 6 is a detail top plan view of the valve. Fig. 7 is a detail bottom plan view of the same. Fig. 8 is a section on the line 8-8, Fig. 7; Fig. 9 is a detail plan View of the reversing plate. Fig. 10 isa section on the line 10-10, Fig. 9.

The invention has relation to rotary valve gear for steam engines having a reciproeating piston, and it consists in the novel construction and combinations of parts, as hereinafter set forth.

In the accompanying drawings, illustrating the invention, the numeral 2 designates the top of the cylinder, and 3 a circular valve box, said top having therein a circular exhaust opening 5, located centrally and concentric of said box; said top having outer diametrically opposite steam ports '1, 7 and 8, 8', also concentric of said box, a port 7 and 8 being located adjacent to each other at each side of said box. 1

Fitting within the valve box, upon the top of the cylinder, is the reversing disk or plate 8 having therein central approximately sector-form ports 9, 9', divided by partition 10, and diametrically opposite ports 11, 11, located near the edge of the late and registering with either ports 7,?"

G. Gonsoiv, a citizen of the United States, resident of Ash.

ton, in the county of Fremont andState of I Idaho,-have madea certain new anduseful' Invention in steam Engine .Valve-Gearj or 8, 8, ac-

cording to the adjustment of the reversing plate, which-is operated by suitable means,- 'usually a Slldlng lOCl or bar a, hav ng rack. teeth Zuengagmg arcuate racli teeth 0, ofthe reversing plate, the ports 9, 9being always top of the steam chest.

Fitting, upon the reversing plate, within the valve box, is the rotary valve plate 14,

having therein an arcuate elongated steam port 15, of approximately nlnety degrees in extent and located near the edge of the plate. Y

at one side thereof, the bottom of said plate having at the other side thereof a sector form chamber 1.5, also of aboutninety degrees measurement. This valve plate is designed to be turned by the-shaft of the cu 'gme wheels, having a 'dri'vlngconnection therewith, preferably by means of a shaft '16, operating said plate and operated by.

chain connection 18 with the engine shaft. 1 F tting upon the valve plate, 111 the valve box. is the cushion or'toplplate 19, havingv ports 20, '20 and 21 21, corresponding in location and size with the portsT, 7' and 8 8 of the top-of the cylinder, this plate 19 being separated from the top of the steam chest to form a chamberQQ, wherein steam is introduced suitably, as by pipe 23.

In operation, the reversing plate being in one position of adjustment, shown inFig. 3

of the drawings, as the valve plate is turned, the steam in chamber 22 will enter through port 20then through port 15 of the valve platethen through port .11 of the reversing plate, and finally through port 7 of the top of the cylinder, the last named port having communication by. passage 24 with one end of the cylinder.

As the valve plate is turning to admit the steam to the end of the cylinder, as stated, the long opening of the port thereof will provide for an extended admission of the steam, determined by the length of ihe port, and while this port is passing in register with the other ports, as stated, the chamber 15 will bridge the ports 7, 5 of the top of the cylinder, bring-. ing them into communication to establish the exhaust from the other end of the cylinde r, through passage 25 Fat erally to the atmosphere.

As the valve plate continues to turn,.the port 20 will be closed and steam cut ofi therefrom, the port 20 being then opened to admit steam thereto, from which it will pass in register with the exhaust port 5 of the QLL.

sure, whereby cldse, steai through the portof the valve plate, the port- 11 of the reversing disk and through port;

r by passage 26 with one end of the cylinder.

And as the valve plate turns to admit steam to the GIlClQfthe cylinder, as stated, the chamber 'l5--will bridge the ports-8, 5 of the top of the cylinder, to establish the exhaust from the other end of the-'fcylinder,

through passage25.

e As the valve" plate continues to turn, the port 21 will be. closed-and steam cut off therefrom, the port 21 being then opened to admit steam thereto, from which it will pass through the port of the valverplate, the port 1 1 of the reversing disk, and through port 8 of the 'top of the cylinder, through passage 24 to the opposite end of the cylinder, the chamber 15' at the same time bridging the ports 8', 5, to establish the exhaust.

In order to provide a stearntight joint for the valve under the" conditions of ordinary shop practice, and to allow'for wear, the valve and reversing plate are designed to be nieunted as follows: In the cylinder wall 2 provided a journal seat 28', and the reversplate/is formed with a central hollow boss 29 designed for bearing engagement with said seat. ,Thevalve plate 14 has an inner central bearing stud 30, registering with the hollow of said boss, and opposite this stud is provided with a prismatic seat 31, designed for loose, automatically adjustable engagement by a similarly formed end oi the driving shaft 16; The joints of the interfittingjparts are truly ground, and the top plate is bolted to the cylinder at 27, cm; the plates in their seats as an independent imit. The plates, being separate iromthe dri s 'ing means, will tend to adjust themselves in their, seats gider steam prestight joint is inunder all conditions, v

of the top of the cylinder, throughpassage 26 to the opposite end of the cylinder,

. when claim is:

1. In valve gear for steam engines, the combinatipn-with an engine cylinder having steam ports communicating with opposite ends thereofi' of a steam chest having two sets of diametrically opposite lateral ports, .the ports of each set communicating with f yoppositesteam ports, an exhaust port in said chest, a rota'ryvalve having at one side a long arcuate port and at the other .side a' long chamber to bridge successively the lateral ports and the exhaust-port, a reversing plate having diametrically. opposite ports" I adapted to; register with either 'set of said:

lateral ports and to close the other set of saidports, and means for. rotatably; mounting said valve and said plate, comprising a journal seated in the cylinder wall, a hollow boss upon said plate in negist'er with said journal seat, a stud upon said valve engag-v ing the hollow; of said loose, a prismatic seat in said valve opposite said'studj, and a driving shaft loosely engagingsaid prismatic seat.

2. In valve gear for steam engines, the

combination with an engine cylinder having steam ports communicating, with opposite ends thereof, of a steam chest having'two f; sets of diametrically opposite lateral. ports; the ports of each set communicating with opposite steam ports, an exhaust port in said chest, a rotary valve having at one side a long arcuate port and at the; other! side :a long chamber to bridge successively the lateral ports and the exhaust port, a reversing plate having diametrically opposite ports adapted to register with either set of said lateral ports and to close the other set'of said ports, and means for rotatably mounting said valve and said plate, comprising a journal seat in the cylinder'wall, a hollow boss upon said plate in register with said journal seat, a stud upon said valve engaging the hollow'oi' said boss, a prismatic seat i in said valve opposite said stud, a driving shaft loosely engaging said prismatic seat,

and a retaining plate secured to said cylinder wall and engaging said valvie.

In testimony whereof I affix my signature, in presence of two witnesses.

I AMUEL G.' COLSON. Witnesses: r

W. L. RoBr'NsoN, I Joe. 0. Mame.

*Jopl s of this natent'may be ibta'in'ed for five cents each, by addressing the Commissioner of Patents,

.- Y i Washington, D. G. I y 

